python - jack 服务器未运行或无法启动

Question

尝试在 python 中使用 pyaudio 时出现以下错误。

Python 2.7.10 (default, Oct 14 2015, 16:09:02) 
[GCC 5.2.1 20151010] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyaudio
>>> p = pyaudio.PyAudio()
ALSA lib pcm.c:2267:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2267:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2267:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started

这个问题似乎是特定于某个版本的 pyaudio，因此尝试更新。当我尝试更新 pyaudio 时:

abhishek@vaio:/etc/apt/sources.list.d$ sudo pip install pyaudio --upgrade  
The directory '/home/abhishek/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.                               
The directory '/home/abhishek/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.                                      
Collecting pyaudio
  Downloading PyAudio-0.2.9.tar.gz (289kB)
    100% |████████████████████████████████| 296kB 539kB/s 
Installing collected packages: pyaudio
  Found existing installation: PyAudio 0.2.8
    DEPRECATION: Uninstalling a distutils installed project (pyaudio) has been deprecated and will be removed in a future version. This is due to the fact that uninstalling a distutils project will only partially uninstall the project.                                               
    Uninstalling PyAudio-0.2.8:
      Successfully uninstalled PyAudio-0.2.8
  Running setup.py install for pyaudio ... error
    Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-15VuRi/pyaudio/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-QGLaRp-record/install-record.txt --single-version-externally-managed --compile:
    running install
    running build
    running build_py
    creating build
    creating build/lib.linux-x86_64-2.7
    copying src/pyaudio.py -> build/lib.linux-x86_64-2.7
    running build_ext
    building '_portaudio' extension
    creating build/temp.linux-x86_64-2.7
    creating build/temp.linux-x86_64-2.7/src
    x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c src/_portaudiomodule.c -o build/temp.linux-x86_64-2.7/src/_portaudiomodule.o
    src/_portaudiomodule.c:28:20: fatal error: Python.h: No such file or directory
    compilation terminated.
    error: command 'x86_64-linux-gnu-gcc' failed with exit status 1

    ----------------------------------------
  Rolling back uninstall of PyAudio
Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-15VuRi/pyaudio/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-QGLaRp-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-15VuRi/pyaudio/                                                                                      

Answer 1

这些消息都不是真正的错误。 PortAudio 只是“ping”所有可能的主机 API 和设备，并查看它们是否可用。这通常会导致终端上出现一些消息，在大多数情况下可以忽略这些消息。

如果您想要一个不打印这些消息的 Python PortAudio 包装器(因为它会为您抑制它们)，请查看 sounddevice模块。